The Simulation of Turbomachinery Tone Noise Based on In-Duct Mode Matching Method

Abstract

CFD has been used for the evaluation of rotor/stator int eraction tone noise. The triple-plane pressure (TPP) matching strategy is a method that used to connect the source region to the acoustic propagation region and extract acoustic data from CFD results. This acoustic data can be used as the evaluating indicator of the tone noise level and also the source term of the Computational Aeroacoustics (CAA) propagation region of sound radiation in turbomachinery. Extending grid out of the physical computing zones could reduce boundary reflection efficiently; a simple relationship which gives better inhibition without excessive cost is shown in the paper based on 2D CFD simulation. The last stage of an aircraft engine’s low pressure turbine was chosen for the research. As known, when augmenting the axial distance between rotor and stator the rotor/stator interaction tonal noise level could be reduced, this effect was captured by using the mode-matching method successfully, which delineated that using such method as a evaluating measure of the noise decreasing technique is feasible in turbomachinery design.